rmt.c revision 1553
1/* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35static char copyright[] = 36"@(#) Copyright (c) 1983, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41static char sccsid[] = "@(#)rmt.c 8.1 (Berkeley) 6/6/93"; 42#endif /* not lint */ 43 44/* 45 * rmt 46 */ 47#include <sys/types.h> 48#include <sys/socket.h> 49#include <sys/mtio.h> 50#include <errno.h> 51#include <fcntl.h> 52#include <sgtty.h> 53#include <stdio.h> 54#include <stdlib.h> 55#include <string.h> 56#include <unistd.h> 57 58int tape = -1; 59 60char *record; 61int maxrecsize = -1; 62 63#define SSIZE 64 64char device[SSIZE]; 65char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE]; 66 67char resp[BUFSIZ]; 68 69FILE *debug; 70#define DEBUG(f) if (debug) fprintf(debug, f) 71#define DEBUG1(f,a) if (debug) fprintf(debug, f, a) 72#define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2) 73 74char *checkbuf __P((char *, int)); 75void error __P((int)); 76void getstring __P((char *)); 77 78int 79main(argc, argv) 80 int argc; 81 char **argv; 82{ 83 int rval; 84 char c; 85 int n, i, cc; 86 87 argc--, argv++; 88 if (argc > 0) { 89 debug = fopen(*argv, "w"); 90 if (debug == 0) 91 exit(1); 92 (void)setbuf(debug, (char *)0); 93 } 94top: 95 errno = 0; 96 rval = 0; 97 if (read(0, &c, 1) != 1) 98 exit(0); 99 switch (c) { 100 101 case 'O': 102 if (tape >= 0) 103 (void) close(tape); 104 getstring(device); 105 getstring(mode); 106 DEBUG2("rmtd: O %s %s\n", device, mode); 107 tape = open(device, atoi(mode)); 108 if (tape < 0) 109 goto ioerror; 110 goto respond; 111 112 case 'C': 113 DEBUG("rmtd: C\n"); 114 getstring(device); /* discard */ 115 if (close(tape) < 0) 116 goto ioerror; 117 tape = -1; 118 goto respond; 119 120 case 'L': 121 getstring(count); 122 getstring(pos); 123 DEBUG2("rmtd: L %s %s\n", count, pos); 124 rval = lseek(tape, (off_t)atol(count), atoi(pos)); 125 if (rval < 0) 126 goto ioerror; 127 goto respond; 128 129 case 'W': 130 getstring(count); 131 n = atoi(count); 132 DEBUG1("rmtd: W %s\n", count); 133 record = checkbuf(record, n); 134 for (i = 0; i < n; i += cc) { 135 cc = read(0, &record[i], n - i); 136 if (cc <= 0) { 137 DEBUG("rmtd: premature eof\n"); 138 exit(2); 139 } 140 } 141 rval = write(tape, record, n); 142 if (rval < 0) 143 goto ioerror; 144 goto respond; 145 146 case 'R': 147 getstring(count); 148 DEBUG1("rmtd: R %s\n", count); 149 n = atoi(count); 150 record = checkbuf(record, n); 151 rval = read(tape, record, n); 152 if (rval < 0) 153 goto ioerror; 154 (void)sprintf(resp, "A%d\n", rval); 155 (void)write(1, resp, strlen(resp)); 156 (void)write(1, record, rval); 157 goto top; 158 159 case 'I': 160 getstring(op); 161 getstring(count); 162 DEBUG2("rmtd: I %s %s\n", op, count); 163 { struct mtop mtop; 164 mtop.mt_op = atoi(op); 165 mtop.mt_count = atoi(count); 166 if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0) 167 goto ioerror; 168 rval = mtop.mt_count; 169 } 170 goto respond; 171 172 case 'S': /* status */ 173 DEBUG("rmtd: S\n"); 174 { struct mtget mtget; 175 if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0) 176 goto ioerror; 177 rval = sizeof (mtget); 178 (void)sprintf(resp, "A%d\n", rval); 179 (void)write(1, resp, strlen(resp)); 180 (void)write(1, (char *)&mtget, sizeof (mtget)); 181 goto top; 182 } 183 184 default: 185 DEBUG1("rmtd: garbage command %c\n", c); 186 exit(3); 187 } 188respond: 189 DEBUG1("rmtd: A %d\n", rval); 190 (void)sprintf(resp, "A%d\n", rval); 191 (void)write(1, resp, strlen(resp)); 192 goto top; 193ioerror: 194 error(errno); 195 goto top; 196} 197 198void 199getstring(bp) 200 char *bp; 201{ 202 int i; 203 char *cp = bp; 204 205 for (i = 0; i < SSIZE; i++) { 206 if (read(0, cp+i, 1) != 1) 207 exit(0); 208 if (cp[i] == '\n') 209 break; 210 } 211 cp[i] = '\0'; 212} 213 214char * 215checkbuf(record, size) 216 char *record; 217 int size; 218{ 219 220 if (size <= maxrecsize) 221 return (record); 222 if (record != 0) 223 free(record); 224 record = malloc(size); 225 if (record == 0) { 226 DEBUG("rmtd: cannot allocate buffer space\n"); 227 exit(4); 228 } 229 maxrecsize = size; 230 while (size > 1024 && 231 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0) 232 size -= 1024; 233 return (record); 234} 235 236void 237error(num) 238 int num; 239{ 240 241 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num)); 242 (void)sprintf(resp, "E%d\n%s\n", num, strerror(num)); 243 (void)write(1, resp, strlen(resp)); 244} 245